/*! ========================================================================
** Extended Template and Library
** Proc Clock Description Implementation
**
** Copyright (c) 2002 Robert B. Quattlebaum Jr.
**
** This package is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License as
** published by the Free Software Foundation; either version 2 of
** the License, or (at your option) any later version.
**
** This package is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** General Public License for more details.
**
** === N O T E S ===========================================================
**
** This is an internal header file, included by other ETL headers.
** You should not attempt to use it directly.
**
** ========================================================================= */

#ifndef __ETL__CLOCK_SYSTEM_H
#define __ETL__CLOCK_SYSTEM_H

#ifndef _WIN32
# include <time.h>
# define __sys_clock	::clock
# define __sys_time	::time
#else
# ifdef __GNUG__
#  include <time.h>
#  define __sys_clock	::clock
#  define __sys_time	::time
# else
typedef int clock_t;
typedef int time_t;
extern clock_t _clock();
extern time_t _time(time_t *);
#  define CLOCKS_PER_SEC 1000
#  define __sys_clock	_clock
#  define __sys_time	_time
# endif
#endif

_ETL_BEGIN_NAMESPACE

class clock_desc_sys_clock
{
public:
    typedef float value_type;

    inline static bool realtime()
    {
        return false;
    }

    inline static bool proctime()
    {
        return true;
    }

    inline static value_type
    one_second()
    {
        return 1.0f;
    }

    inline static value_type precision()
    {
        return one_second() / (value_type)CLOCKS_PER_SEC;
    }

    inline static const char *description()
    {
        return "ANSI C clock()";
    };

protected:
    typedef clock_t timestamp;

    static void
    get_current_time(timestamp &time)
    {
        time = __sys_clock();
    }

    static timestamp
    get_current_time()
    {
        return __sys_clock();
    }

    static value_type
    timestamp_to_seconds(const timestamp &x)
    {
        return precision() * x;
    }

    static timestamp
    seconds_to_timestamp(const value_type &x)
    {
        return (timestamp)(x * (value_type)CLOCKS_PER_SEC + 0.5);
    }

};

class clock_desc_sys_time
{
public:
    typedef float value_type;

    inline static bool realtime()
    {
        return true;
    }

    inline static bool proctime()
    {
        return false;
    }

    inline static value_type
    one_second()
    {
        return 1.0f;
    }

    inline static value_type precision()
    {
        return one_second();
    }

    inline static const char *description()
    {
        return "ANSI C time()";
    };

protected:
    typedef time_t timestamp;

    static void
    get_current_time(timestamp &time)
    {
        __sys_time(&time);
    }

    static timestamp
    get_current_time()
    {
        return __sys_time(NULL);
    }

    static value_type
    timestamp_to_seconds(const timestamp &x)
    {
        return (value_type)x;
    }

    static timestamp
    seconds_to_timestamp(const value_type &x)
    {
        return (timestamp)(x + (value_type)0.5f);
    }
};

_ETL_END_NAMESPACE

#endif